This won't be a permanent solution (especially if your tenants are leaving food around) butmice do hate the smell of peppermint.

No extra hot peppermint hot chocolate with whip cream and no mocha drizzle for me in the past 3 weeks.

I’m going to get off the computer now and go eat some Peppermint Patties... 

They can do a smoke test or peppermint test.

I did not even know that there was a plant called "peppermint."

I sealed up the garage with the wood strips (went across the bottom of the garage doors where there were gaps) and sealant AFTER I ran them out by tying the rags around rocks and dousing them with pure peppermint oil.

I'm all for mulled wine and peppermint schnapps/hot chocolate!

This is an all natural spray with peppermint oil that will act to cover up their scent of urine.